Centrin is a conserved calcium-binding protein that plays an important role in diverse cellular biological processes such as ciliogenesis, gene expression, DNA repair and signal transduction. In Trypanosoma brucei, TbCentrin4 is mainly localized in basal bodies and bi-lobe structure, and is involved in the processes coordinating karyokinesis and cytokinesis. In the present study, we solved the solution structure of TbCentrin4 using NMR (nuclear magnetic resonance) spectroscopy. TbCentrin4 contains four EF-hand motifs consisting of eight α-helices. Isothermal titration calorimetry experiment showed that TbCentrin4 has a strong Ca2+ binding ability. NMR chemical shift perturbation indicated that TbCentrin4 binds to Ca2+ through its C-terminal domain composed of EF-hand 3 and 4. Meanwhile, we revealed that TbCentrin4 undergoes a conformational change and self-assembly induced by high concentration of Ca2+. Intriguingly, localization of TbCentrin4 was dispersed or disappeared from basal bodies and the bi-lobe structure when the cells were treated with Ca2+in vivo, implying the influence of Ca2+ on the cellular functions of TbCentrin4. Besides, we observed the interactions between TbCentrin4 and other Tbcentrins and revealed that the interactions are Ca2+ dependent. Our findings provide a structural basis for better understanding the biological functions of TbCentrin4 in the relevant cellular processes.
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December 2018
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Research Article|
December 06 2018
Solution structure of TbCentrin4 from Trypanosoma brucei and its interactions with Ca2+ and other centrins
Fangzhen Shan
;
Fangzhen Shan
1Hefei National Laboratory for Physical Science at Microscale and School of Life Science, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
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Kaiqin Ye;
Kaiqin Ye
2Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Chinese Academy of Sciences, Hefei, Anhui, People's Republic of China
3Cancer Hospital, Chinese Academy of Science, Hefei, Anhui, People's Republic of China
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Jiahai Zhang;
Jiahai Zhang
1Hefei National Laboratory for Physical Science at Microscale and School of Life Science, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
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Shanhui Liao;
Shanhui Liao
1Hefei National Laboratory for Physical Science at Microscale and School of Life Science, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
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Xuecheng Zhang;
Xuecheng Zhang
4School of Life Sciences, Anhui University, Hefei, Anhui, People's Republic of China
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Chao Xu;
Chao Xu
1Hefei National Laboratory for Physical Science at Microscale and School of Life Science, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
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Xiaoming Tu
1Hefei National Laboratory for Physical Science at Microscale and School of Life Science, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
Correspondence: Xiaoming Tu (xmtu@ustc.edu.cn)
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Publisher: Portland Press Ltd
Received:
September 17 2018
Revision Received:
October 30 2018
Accepted:
November 01 2018
Accepted Manuscript online:
November 02 2018
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© 2018 The Author(s). Published by Portland Press Limited on behalf of the Biochemical Society
2018
Biochem J (2018) 475 (23): 3763–3778.
Article history
Received:
September 17 2018
Revision Received:
October 30 2018
Accepted:
November 01 2018
Accepted Manuscript online:
November 02 2018
Citation
Fangzhen Shan, Kaiqin Ye, Jiahai Zhang, Shanhui Liao, Xuecheng Zhang, Chao Xu, Xiaoming Tu; Solution structure of TbCentrin4 from Trypanosoma brucei and its interactions with Ca2+ and other centrins. Biochem J 12 December 2018; 475 (23): 3763–3778. doi: https://doi.org/10.1042/BCJ20180752
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